Who was the wall of hadrian supposed to keep out?

Emperor Hadrian

Under Hadrian's orders, the Roman governors of Britain began building the wall that would later be named for the emperor to defend the part of Britain they controlled from attack. In Hadrian's words, they wanted to “separate Romans from the barbarians” to the north.

What was Hadrian's Wall? Hadrian's Wall was a stone barrier built to separate the Romans and the Picts tribes in Scotland. It allowed Roman soldiers to control the movements of people coming into or leaving Roman Britain.

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